| Shone House Ltd | Households | 2017 |
| Shopova Limited | Construction | 2025 |
| Shortwood Residents Association (Woking) Limited | Households | 1992 |
| Show Homes International Limited | Construction | 2015 |
| Shrimatrye Limited | Information & communication | 2025 |
| SIA Beauty Limited | Other services | 2010 |
| Sial Enterprise Ltd | Wholesale & retail | 2021 |
| Siam Serenity Retreat & Spa Ltd | Other services | 2026 |
| Sian Enterprises Ltd | Administrative & support | 2020 |
| Siba Consultancy Ltd | Administrative & support | 2021 |
| Sibtons Services Ltd | Water & waste | 2024 |
| Sicm Limited | Construction | 2019 |
| Siddhic Group Limited | Professional & scientific | 2017 |
| Siddiqi Enterprises Limited | Real estate | 2021 |
| Sidmouth Court (Cheam) Residents Association Limited | Households | 1968 |
| Sienna AI Ltd | Information & communication | 2023 |
| Siete Consulting Limited | Information & communication | 2018 |
| Signature Health Consulting Ltd | Professional & scientific | 2018 |
| SIJ Associates Ltd | Health & social care | 2014 |
| Silhouette Stills Limited | Manufacturing | 2022 |
| Sillett Investments Ltd | Arts & recreation | 2026 |
| Silova Properties Ltd | Real estate | 2025 |
| Silvanas Cleaner Ltd | Administrative & support | 2025 |
| Silver Bullet Developments Limited | Professional & scientific | 2022 |
| Silver Darlings Consultancy Ltd | Education | 2024 |
| Silver Diamond Property Limited | Real estate | 2017 |
| Silver Imitation Accessories (SIA) Ltd. | Other services | 2001 |
| Silver Strand Ltd | Professional & scientific | 2013 |
| Silverfleet Capital Limited | Financial services | 1984 |
| Silvergates Property Limited | Households | 2026 |
| Silversands Estates Ltd | Real estate | 2018 |
| Silvester Oakleigh Limited | Manufacturing | 2022 |
| Silvestri Holdings Ltd | Other services | 2023 |
| SIM Free World Limited | Information & communication | 2014 |
| Simioni Ltd | Financial services | 2021 |
| Simioni’S Academy Ltd | Other services | 2023 |
| Simioni’S Mentory & Co. Ltd | Other services | 2023 |
| Simioni’S Skin-To-Skin Santuary Ltd | Other services | 2023 |
| Simon Tidman Confectionery Consultancy Limited | Manufacturing | 2010 |
| Simosim Limited | Professional & scientific | 2018 |
| Simplemain Limited | Professional & scientific | 1992 |
| Simply Delivered Limited | Professional & scientific | 2023 |
| Simply Media TV Limited | Wholesale & retail | 2003 |
| Simtech Electrical Ltd | Construction | 2026 |
| Simultra Limited | Wholesale & retail | 2025 |
| Sincas Pharma Limited | Professional & scientific | 2020 |
| Sinclair Property Services Ltd | Real estate | 2016 |
| Sindu & Co Ltd | Health & social care | 2025 |
| Sing Fabulous Limited | Arts & recreation | 2022 |
| Singh Groundworks Ltd | Construction | 2020 |
| Sinspeed Ltd | Manufacturing | 2025 |
| Siri Properties Ltd | Real estate | 2019 |
| Sixens Ltd | Wholesale & retail | 2018 |
| SJ & RS Properties Limited | Real estate | 2016 |
| SJ Financial Advice Ltd | Financial services | 2008 |
| Sjbailey Ltd | Construction | 2020 |
| SJK Contracting Limited | Professional & scientific | 2012 |
| SJK Electrical Contractors Limited | Construction | 2013 |
| SJP Beaulieu Consulting Limited | Professional & scientific | 2021 |
| SK Surgical Solutions Limited | Health & social care | 2023 |
| SKA Access Ltd. | Construction | 2017 |
| Skan Ventures Limited | Information & communication | 2008 |
| Skanthashram | Education | 2016 |
| SKB Investments (Horley Road) Limited | Real estate | 2020 |
| SKB Investments (Surrey) Limited | Real estate | 2020 |
| Skin Aesthetics Limited | Other services | 2017 |
| Skinconsultancyservices Limited | Health & social care | 2024 |
| Skip IT Epsom Ltd | Real estate | 2010 |
| Skip IT Waste Management Limited | Water & waste | 1999 |
| Skizzle Limited | Real estate | 2014 |
| Skn-On Ltd | Wholesale & retail | 2025 |
| Skratch Plays Ltd | Information & communication | 2023 |
| Sky & Co Property Ventures Ltd | Construction | 2025 |
| Sky Cleaning Ltd | Administrative & support | 2017 |
| Sky POS (UK) Limited | Wholesale & retail | 2023 |
| Skydrop Ltd | Other services | 2013 |
| Skye Digital Ltd | Information & communication | 2026 |
| Skyguard Limited | Professional & scientific | 2000 |
| Skyline Home Care Services Limited | Health & social care | 2018 |
| Skyrah Beauty Limited | Other services | 2011 |
| Skyroom Suffolk Limited | Extraterritorial | 2012 |
| Skyscrapers UK Limited | Manufacturing | 1991 |
| Skyway Windows Limited | Manufacturing | 2021 |
| SL Moves Ltd | Extraterritorial | 2021 |
| Sladbury Barns SPV Limited | Construction | 2025 |
| Slinger BAG International (UK) Limited | Manufacturing | 2019 |
| Slingshot (UK) Ltd | Transport & logistics | 2006 |
| Slls Consulting Limited | Professional & scientific | 2025 |
| Sloanebridge Properties Limited | Households | 1972 |
| SLP Ventures Limited | Professional & scientific | 2006 |
| SLS Media Limited | Information & communication | 2002 |
| SLX Design Ltd | Professional & scientific | 2013 |
| SM Ventures Limited | Professional & scientific | 2011 |
| Smandlb Ltd | Arts & recreation | 2025 |
| Smart Enquiry Ltd | Administrative & support | 2012 |
| Smart Home IT Solutions Ltd | Construction | 2021 |
| Smart Instinct Limited | Wholesale & retail | 2017 |
| Smart Money People Limited | Information & communication | 2014 |
| Smartfix Property Services Ltd | Construction | 2026 |
| Smartg Investments Ltd | Real estate | 2023 |